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Newer ThinkPads make use of high performance CPUs that may require more power than what the 65W adapter can provide while also supporting USB, Optical and other attached devices, especially in docked configurations. To prevent the potential for sudden system shut down if the power demand exceeds what the adapter can supply, the maximum clock speed may be limited when the system is operated on the 65W AC adapter and no battery is installed.

Affected configurations

The following ThinkPad systems may be affected by this symptom:

Edge 13", E30

Edge E120, Edge E320

L420, L520

R60, R60e, R61, R61e

R400, R500,

T60, T60p, T61, T61p

T400, T410, T410i, T410s, T410si, T500, T510, T510i

T420, T420i, T420s, T420si, T520, T520i

W500, W510, W520

W700, W700ds, W701, W701ds

X1,X121e

X61, X61s, X61 Tablet

X200, X200s

X201, X201i, X201s, X201 Tablet

X220, X220i, X220 Tablet﻿

X230 Tablet

X300, X301

Solution

If maximum frequency operation is preferred in such situations, a 90W AC adapter should be used. Additionally, operating with battery in circuit offers additional protection of data in the loss of AC input power.